{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=OBSERVATIONAL+REGISTRY",
    "query": {
      "intervention": "OBSERVATIONAL REGISTRY"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 348,
    "total_pages": 35,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=OBSERVATIONAL+REGISTRY&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-22T11:46:58.625Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT05925049",
      "title": "A Study Utilising Data From European Union (EU) National Multiple Sclerosis (MS) Registries to Assess the Incidence of Anti-Natalizumab Antibody Among Participants Who Receive Subcutaneous Administration of Natalizumab for Treatment of Relapsing-remitting Multiple Sclerosis (RRMS)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "Natalizumab",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Biogen",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "18 Years to 64 Years"
      },
      "enrollment_count": 400,
      "start_date": "2023-06-30",
      "completion_date": "2026-10-31",
      "has_results": false,
      "last_update_posted_date": "2026-05-13",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Cambridge, Massachusetts",
      "locations": [
        {
          "city": "Cambridge",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05925049"
    },
    {
      "nct_id": "NCT03438487",
      "title": "Flucelvax (TIVc or QIVc) Pregnancy Registry",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Influenza, Human",
        "Pregnancy",
        "Birth Defect"
      ],
      "interventions": [
        {
          "name": "Flucelvax Trivalent Influenza Vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Flucelvax Quadrivalent Influenza Vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 692,
      "start_date": "2017-09-01",
      "completion_date": "2020-12-31",
      "has_results": false,
      "last_update_posted_date": "2022-11-04",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Wilmington, North Carolina",
      "locations": [
        {
          "city": "Wilmington",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03438487"
    },
    {
      "nct_id": "NCT04723095",
      "title": "Establishing a Tumor Registry for Patients With Neuroendocrine Carcinoma of the Cervix",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cervical Large Cell Neuroendocrine Carcinoma",
        "Cervical Neuroendocrine Carcinoma",
        "Cervical Small Cell Carcinoma",
        "Cervical Undifferentiated Carcinoma",
        "Stage I Cervical Cancer AJCC v8",
        "Stage IA Cervical Cancer AJCC v8",
        "Stage IA1 Cervical Cancer AJCC v8",
        "Stage IA2 Cervical Cancer AJCC v8",
        "Stage IB Cervical Cancer AJCC v8",
        "Stage IB1 Cervical Cancer AJCC v8",
        "Stage IB2 Cervical Cancer AJCC v8",
        "Stage II Cervical Cancer AJCC v8",
        "Stage IIA Cervical Cancer AJCC v8",
        "Stage IIA1 Cervical Cancer AJCC v8",
        "Stage IIA2 Cervical Cancer AJCC v8",
        "Stage IIB Cervical Cancer AJCC v8",
        "Stage III Cervical Cancer AJCC v8",
        "Stage IIIA Cervical Cancer AJCC v8",
        "Stage IIIB Cervical Cancer AJCC v8",
        "Stage IV Cervical Cancer AJCC v8",
        "Stage IVA Cervical Cancer AJCC v8",
        "Stage IVB Cervical Cancer AJCC v8"
      ],
      "interventions": [
        {
          "name": "Follow-Up",
          "type": "OTHER"
        },
        {
          "name": "Medical Chart Review",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 750,
      "start_date": "2013-05-16",
      "completion_date": "2044-01-01",
      "has_results": false,
      "last_update_posted_date": "2026-09-14",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04723095"
    },
    {
      "nct_id": "NCT00860548",
      "title": "SCOT Scleroderma Treatment Alternative Registry (STAR Registry)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Scleroderma, Systemic",
        "Sclerosis"
      ],
      "interventions": [
        {
          "name": "currently available therapy in the community",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "69 Years",
        "sex": "ALL",
        "summary": "18 Years to 69 Years"
      },
      "enrollment_count": 19,
      "start_date": "2005-06",
      "completion_date": "2016-03",
      "has_results": false,
      "last_update_posted_date": "2017-04-05",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00860548"
    },
    {
      "nct_id": "NCT04828070",
      "title": "The Heart Outcomes in Pregnancy Expectations (H.O.P.E) Registry",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Pregnancy Related",
        "Cardiac Disease"
      ],
      "interventions": [
        {
          "name": "Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Saint Luke's Health System",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 55 Years · Female only"
      },
      "enrollment_count": 75,
      "start_date": "2020-12-01",
      "completion_date": "2026-06-30",
      "has_results": false,
      "last_update_posted_date": "2025-10-24",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04828070"
    },
    {
      "nct_id": "NCT02013583",
      "title": "The Glucose Transporter Type I Deficiency (G1D) Registry",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "GLUT1 Deficiency Syndrome",
        "Glucose Transporter Type 1 Deficiency Syndrome",
        "Glucose Transporter Type1 (GLUT-1) Deficiency",
        "GLUT-1 Deficiency Syndrome"
      ],
      "interventions": [
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 471,
      "start_date": "2013-12",
      "completion_date": "2024-08-01",
      "has_results": false,
      "last_update_posted_date": "2025-03-07",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02013583"
    },
    {
      "nct_id": "NCT07541469",
      "title": "Rezdiffra Pregnancy and Lactation Registry",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "MASH - Metabolic Dysfunction-Associated Steatohepatitis"
      ],
      "interventions": [
        {
          "name": "Rezdiffra",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Madrigal Pharmaceuticals, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 10,
      "start_date": "2026-03-04",
      "completion_date": "2030-04-08",
      "has_results": false,
      "last_update_posted_date": "2026-04-21",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "West Conshohocken, Pennsylvania",
      "locations": [
        {
          "city": "West Conshohocken",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07541469"
    },
    {
      "nct_id": "NCT01284257",
      "title": "Observational Registry Study of Renal Transplant Patients",
      "overall_status": "WITHDRAWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Kidney Transplant"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 0,
      "start_date": "2007-06",
      "completion_date": "2010-05",
      "has_results": false,
      "last_update_posted_date": "2017-02-27",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 8,
      "location_summary": "San Francisco, California • Denver, Colorado • Springfield, Massachusetts + 5 more",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Springfield",
          "state": "Massachusetts"
        },
        {
          "city": "Detroit",
          "state": "Michigan"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01284257"
    },
    {
      "nct_id": "NCT06927219",
      "title": "Research Accelerated by You Lupus Registry",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Systemic Lupus Erythematosus (SLE)",
        "Lupus Nephritis (LN)",
        "Cutaneous Lupus Erythematosus (CLE)"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Lupus Foundation of America",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 10000,
      "start_date": "2020-10-01",
      "completion_date": "2050-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-01-23",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06927219"
    },
    {
      "nct_id": "NCT07128966",
      "title": "Direct to Patient Minimal Risk Biospecimen and Data Collection Research",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy",
        "Lupus",
        "Celiac",
        "Kidney Disease",
        "Chronic",
        "Dermatologic"
      ],
      "interventions": [
        {
          "name": "Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Joined Bio",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 100000,
      "start_date": "2025-04-01",
      "completion_date": "2036-09-01",
      "has_results": false,
      "last_update_posted_date": "2026-05-05",
      "last_synced_at": "2026-09-22T11:46:58.625Z",
      "location_count": 1,
      "location_summary": "Lexington, Massachusetts",
      "locations": [
        {
          "city": "Lexington",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07128966"
    }
  ]
}